3 digital audio formats, 1 i2s format, S format – Cirrus Logic CS485xx User Manual
Page 59
4-5
Copyright 2009 Cirrus Logic, Inc.
DS734UM7
Digital Audio Input Port Description
CS485xx Hardware User’s Manual
Figure 4-4. 12-Channel DAI Port Block Diagram
4.2.3 Digital Audio Formats
The DAI data input pins are fully configurable including support for I
2
S and left-justified formats. DAI clock
and data pins support only slave operation. This subsection describes some common audio formats that
CS485xx supports. It should be noted that the input ports use up to 32-bit PCM resolution.
4.2.3.1 I
2
S Format
Figure 4-5
illustrates the I
2
S format. For I
2
S, data is presented most-significant bit (MSB) first, one SCLK
delay after the transition of DAIn_LRCLK, and is valid on the rising edge of DAIn_SCLK. For the I
2
S format,
the left subframe is presented when DAIn_LRCLK is low, and the right subframe is presented when
DAIn_LRCLK is high.
DAI1_DATA0
DMA t
o
Pe
ri
p
h
e
ra
l
Bu
s
DAI1_DATA0
DAI1_DATA1
DAI1_DATA1
DAI1_DATA2
DAI1_DATA2
DAI1_DATA3
DAI1_DATA3
DAI1_DATA5
DAI1_DATA5
DAI_LRCLK2
DAI_SCLK2
DAI1_DATA4
DAI1_DATA4